<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        span {
            color: red;
        }

        /*后代选择器*/
        p span {
            color:blue;
        }
    </style>
</head>
<body>
   <div>
       <span>分萧萧兮易水寒</span>
   </div>

   <p>
       <span>壮士一去兮不复还</span>
   </p>
</body>
</html>